PIC16C745/SP View Datasheet(PDF) - Microchip Technology
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Description
Manufacturer
PIC16C745/SP Datasheet PDF : 158 Pages
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PIC16C745/765
FIGURE 16-8: TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
T0CKI
T1OSO/T1CKI
40
41
42
45
46
47
48
TMR0 or
TMR1
Note: Refer to Figure 16-2 for load conditions.
TABLE 16-5: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Param
No.
Sym
Characteristic
Min
Typ† Max Units Conditions
40* TT0H
T0CKI High Pulse Width
No Prescaler
With Prescaler
0.5 TCY + 20
10
— — ns Must also meet
— — ns parameter 42
41* TT0L
42* TT0P
T0CKI Low Pulse Width
T0CKI Period
No Prescaler
With Prescaler
No Prescaler
0.5 TCY + 20
10
TCY + 40
— — ns Must also meet
— — ns parameter 42
— — ns
With Prescaler Greater of:
20 or TCY + 40
N
— — ns N = prescale value
(2, 4,..., 256)
45* TT1H
T1CKI High Time Synchronous, Prescaler = 1
Synchronous,
Prescaler = 2,4,8
0.5 TCY + 20
15
25
— — ns Must also meet
— — ns parameter 47
— — ns
Asynchronous
30
— — ns
46* TT1L
T1CKI Low Time Synchronous, Prescaler = 1
Synchronous,
Prescaler = 2,4,8
50
0.5 TCY + 20
15
25
— — ns
— — ns Must also meet
— — ns parameter 47
— — ns
Asynchronous
30
— — ns
50
— — ns
47* TT1P
T1CKI input
period
Synchronous
Greater of:
30 OR TCY + 40
N
— — ns N = prescale value
(1, 2, 4, 8)
Greater of:
50 OR TCY + 40
N
N = prescale value
(1, 2, 4, 8)
Asynchronous
60
— — ns
100
— — ns
FT1
Timer1 oscillator input frequency range
(oscillator enabled by setting bit T1OSCEN)
DC
— 200 kHz
48
TCKEZTMR1 Delay from external clock edge to timer increment
2Tosc
— 7Tosc —
* These parameters are characterized but not tested.
† Data in “Typ” column is at 5V, 25°C unless otherwise stated. These parameters are for design guidance only and are not tested.
DS41124A-page 134
Advanced Information
© 1999 Microchip Technology Inc.
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